Datasheet

Section 8 I/O Ports
Rev. 2.00 Sep. 28, 2009 Page 196 of 870
REJ09B0429-0200
8.4.4 Pin Functions
The relationship between register setting values and pin functions are as follows.
The pin function is switched as shown below according to the P4nDDR bit. When the ISSn bit in
ISSR is cleared to 0 and the IRQnE bit in IER of the interrupt controller is set to 1, the pin can be
used as the IRQn input pin. To use as the IRQn input pin, clear the P4nDDR bit to 0.
P4nDDR 0 1
P4n input pin Pin function
IRQn input pin
P4n output pin
[Legend] n = 7 to 0